Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B08—CLEANING
  • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
  • B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
  • B08B15/02—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area using chambers or hoods covering the area
  • B08B15/023—Fume cabinets or cupboards, e.g. for laboratories

Definitions

• the present invention relates to a cabinet acting as a fume cupboard, alternatively as a work bench.
• the cabinet comprises a cabinet hood having side walls, a rear wall and a front with an access opening and a slide door, and ventilation means to* create subpressure in the cabinet or the work bench.
• the equipment is designed in such a manner that the fume cupboards are arranged separate from the work benches which results in extensive space requirements and therefore means that the equipment requires extensive space and, furthermore, the physical separation between fume cupboards and work benches results in impaired installation flexibility.
• the present invention has for its main purpose to provide a modified work cabinet which can be alternatively used as a fume cupboard or as a work bench, this being possible by a simple adjustment procedure within the frame work of the same construction.
• Another purpose of the invention is to provide a work cabinet which results in improved flexibility in connec ⁇ tion with ventilation dynamics and enables a generally improved ventilation.
• Yet another object of the invention is to provide a work cabinet which, in spite of its simple construction, functions well, as a fume cupboard as well as a work bench without setting aside the safety for the laboratory ope ⁇ rator.
• the work cabinet according to the invention comprises a cabinet hood having associated side walls, a double rear wall, a front having an access opening and a slide door, and a work bench having a per ⁇ forature and a ventilation duct for connection to a suc ⁇ tion fan or other means capable of generating subpressure in the cabinet.
• the cabinet according to the invention is characte ⁇ rized by a suction box arranged in the upper part of the cabinet hood, said box being in connection with the ven ⁇ tilation duct and occupying depthwise only part of the upper end of the cabinet which is otherwise open, said box at the lower part thereof being connectable with the in ⁇ terior of the cabinet hood.
• the cabinet is characterized by ducts which connect the area above the perforature or the suction tray to the suction, box, and by an adjustment damper which is adjustable between a first position that essentially blocks the connection between the suction box and the interior of the cabinet hood, and a second position that essentially blocks the connection between the interior of the cabinet hood and the surroundings, whereby the cabinet mainly operates as a fume cupboard.
• said ducts are arranged adjacent to the rear wall of the cabinet and, optionally, also in association with the side walls of the cabinet. It is particularly preferred that at least a first duct is arranged adjacent to the rear wall and that at the lower end thereof it is connected to the suction tray for down- ward suction through the perforature.
• At least a second duct is arranged adjacent to each of the side walls and adjacent to the rear wall on each side of said first duct. These second ducts open at the lower end thereof into the area above the perforature for suction backwardly across said perforature.
• said first duct which is connected to the suction tray is flanked by said second ducts opening into the area above the perforator, said ducts thus being arranged adjacent to the rear wall 25.
• said suction box is provided with a down ⁇ wardly oriented wall thus separating at its upper end the suction box area from the other part of the cabinet.
• the damper is preferably pivotably arranged at the lower edge of the downwardly oriented wall.
• the connection between the suction box and the interior of the cabinet contains a restriction element or grid, whereby the flow resistance through said connection can be controlled.
• a drive motor particularly an electric one
• the damper can be moved between the two positions for changing the cabinet to a fume cupboard or to a work bench.
• the slide door may be con ⁇ nected to a counter weight, for example via cords running over pulleys, whereby its displacement upwardly is facili ⁇ tated by balancing the weight of the slide door.
• a lamp mounting is suitably placed on the front of the cabinet above the working position.
• the cabinet according to the present in ⁇ vention is at its upper part provided with a suction box extending essentially across the full width of the cabinet and suitably being positioned adjacent to the rear wall of the cabinet.
• the adjustable damper means that the venti ⁇ lation characteristics of the cabinet can be changed between on the one hand the use of the cabinet as a fume cupboard and on the other hand for use as a work bench. In between intermediate positions can be used as desired de ⁇ pendent on the type of work performed in the cabinet.
• the cabinet according to the invention either operates as a fume cupboard or as a work bench.
• the in ⁇ vention is not restricted to this description of a pre ⁇ ferred embodiment. Said embodiment is presented in the following disclosure made in association with the appended drawings, wherein:
• Fig. 1 shows diagrammatically a front view of a cabinet designed in accordance with the invention
• Fig. 2 shows a side view of the cabinet according to Fig. 1;
• Fig. 3 shows a plan view in a section along line A-A in Fig. 2..
• the work cabinet shown in the drawings and generally designated 1 comprises, in a conventional manner, a cabinet hood 3 provided with side walls 4 and a rear wall 25.
• the front of the cabinet is provided with an access opening 7 with an associated slide door 9 which, by means of a handle 11, can be moved upwardly or downwardly to a suitable access opening, the position shown in Fig. 2.
• the cabinet is provided with a counter weight 17 which, via cords 13, is connected to the upper part of the slide door 9.
• cords 13 travel over pulleys 15 arranged at the upper part of the cabinet.
• the slide door 9 moves in a space inside the front of the cabinet defined by a downwardly directed wall section 18 at the upper end of the cabinet.
• the cabinet 1 rests on four legs 5 for providing suitable working level.
• the cabinet can, of course, be anchored directly against the wall in a laboratory space without the use of legs.
• a work surface or work bench 19 is arranged which is provided with a perforated sheet 23 having openings 24 and a suction tray 21 arranged under the perforated sheet or perforature. Furthermore, there is arranged on one side of the cabinet in a conven ⁇ tional manner a discharge funnel 20 and discharge means 22 for water, gas etc.
• suction box 33 In association with the rear wall 25, which is double so as to create a space 27 for the counter weight 17, two side ducts 29 and one central duct 31 are arranged. In association with the upper part of the rear wall 25 a suction box 33 is arranged which is provided with a front wall 35, and via a perforated grid 37 the suction box 33 is in communication with the interior of the cabinet. Furthermore, suction box 33 is provided with a ventilation duct 39 for connection to a suction fan not shown for pro ⁇ viding subpressure in the cabinet and thereby the desired ventilation.
• the central duct 31 opens at its upper end into the suction box 33, whereas at its lower end it is in connec ⁇ tion with the suction tray 21 for a purpose to be de ⁇ scribed below.
• the flanking side ducts 29 are also at their upper ends in connection with the suction box 33 but open at their lower ends in the area above the perforature 23, also here for a purpose to be described below.
• a ma- nually or motor-operated adjustment damper 41 is provided which can be pivoted between the extreme positions indi ⁇ cated L. and L- in Fig. 2.
• This adjustment damper 41 can be controlled manually or via an electric motor 43 dia- grammatically shown in Fig. 1.
• the motor 43 is operated from the control panel 40 by means of control means 45 and 47, actuating control member 47 bringing damper 41 to position L. , whereas actuating control member 45 bringing damper 41 to position L-.
• cabinet 1 shall be used for working with substances which require heating where poisonous vapours are generated.
• the ca ⁇ binet in this case shall function as a fume cupboard.
• damper 41 By means of pressing knob 45 damper 41 is moved to the position shown by L 2 in Fig. 2 by means of the driving motor 43. This will cause essential blockage of the direct connection between the interior of the cabinet and the surrounding via the otherwise open upper end. Wit damper 41 in this position there is thus established con- nection between the suction box 33 and the interior of th cabinet via the perforated grid 37, and ventilation is maintained in the cabinet by an upwardly directed air flo as in a normally operating fume cupboard. In a closed con dition about 50% of the ventilation air leaves by a passage through the perforated grid, whereas the reminder passes via ducts 29 over the perforature 23 and a minor part also through the central duct 31 through the per ⁇ forature 23.
• the damper 41 When work of work bench nature shall be carried out, which normally takes place without heating of the chemi ⁇ cals involved, the damper 41 is adjusted to the position shown by L 1 in Fig. 2 by pressing knob 47.
• the cabinet according to the invention operates as a work bench in that the connection between the inte ⁇ rior of the cabinet and the surrounding via the partially open upper part of the cabinet results in downwardly di- rected ventilation in the cabinet, where the major part of the air passes down through perforature 23 and up through the cental duct 31, whereas a minor part, for example about 30%, of the ventilation air passes out through side ducts 29, the remaining about 10% passing out through suction tray 33 by leakage around damper 41.
• the materials are conventional and the cabinet frame work can be made for example using a particle board and a white laminate, whereas the slide door can be made of a safety laminate glass and the work bench made with a perforature of acid-proof stainless steel.
• the work surface may, of course, also be made from any resistant polymer, such as polypropylene, or from enamel or ceramic or an epoxi material.
• the instrument panel 40 placed at one side of the cabinet results in ease of survey and simple operation, and installation connections involved can take place both from floor or from roof or both. Even if the invention has been described in con ⁇ nection with a specific preferred embodiment the invention is in no way restricted to this with regard to construc ⁇ tional details or function in other respects. The skilled artisan easily realizes how modifications and changes can be made within the scope of the appended patent claims.

Landscapes

• Ventilation (AREA)
• Glass Compositions (AREA)
• Forging (AREA)
• Tumbler Switches (AREA)
• Combinations Of Kitchen Furniture (AREA)
• Saccharide Compounds (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Cookers (AREA)
• Pens And Brushes (AREA)
• Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
• Devices For Use In Laboratory Experiments (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20391051

Family Applications (1)

Country Status (8)

Cited By (1)

Families Citing this family (1)

Citations (3)

• 1993
  • 1993-09-10 SE SE9302943A patent/SE501870C2/sv not_active IP Right Cessation
• 1994
  • 1994-09-07 AT AT94919040T patent/ATE178815T1/de not_active IP Right Cessation
  • 1994-09-07 WO PCT/SE1994/000832 patent/WO1995007154A1/en active IP Right Grant
  • 1994-09-07 DK DK94919040T patent/DK0725687T3/da active
  • 1994-09-07 DE DE69417911T patent/DE69417911D1/de not_active Expired - Lifetime
  • 1994-09-07 EP EP94919040A patent/EP0725687B1/de not_active Expired - Lifetime
• 1996
  • 1996-03-08 NO NO960983A patent/NO301154B1/no not_active IP Right Cessation
  • 1996-03-08 FI FI961092A patent/FI105458B/fi active

Patent Citations (3)

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